Sofa



FIG. 1 is a front perspective view showing our new design in the form of a sofa;

FIG. 2 is a front elevational view thereof,

FIG. 3 is a top view thereof,

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a rear perspective view thereof. 

The ornamental design for a sofa, as shown and described. 